Why are my front vents on my Chevy Trailblazer not working?

Recently my front vents stopped working on my 2004 Chevy Trailblazer. I’ve tried to recalibrate by taking out the fuse, waiting a couple minutes, putting the fuse back in, turning the car to run, letting it go through its motions, but that didn’t work. The air blows cold, but it is only coming out at the feet, side vents and defrost.

Why does air not blow out the dash vents?

The air won’t blow out the dash vents. It blows out the floor vent and the defroster vent, but it won’t change and blow out the dash vent. Any one know what I need to do to fix this problem?

Where are the vents on a car located?

Step 1 – Most air control vents are equipped with a flow control door that is located at the vent outlet. This door is controlled by a thumb wheel that when activated will open and close the vent air flow door. Work the thumb wheel from one side to the other while checking the airflow.

Why is the pass vent on my heater not working?

There is a blend door in your heater and it’s either stuck or not working. It ‘s electrical or vacuum. You can reach your hand under the dash and see if you can move it one way or the other. You should be able to see if it will start to put the pass vent cold or not.

Can a trailblazer blow cold air from one side?

An expert who has achieved level 1. Visited the website for 2 consecutive days. Re: TRAILBLAZER BLOWING OUT COLD AIR FROM ONE SIDE AND…

Why is my air conditioner not blowing cold air?

A defective relay, compressor clutch coil or damaged compressor are all possibilities. The air conditioning system is equipped with safety switches that automatically turn the compressor off when the A/C refrigerant level becomes low.

Why is air not blowing through the vents?

The air conditioner is blowing cold and hot at the same time, cold on every vent besides the passengrer side. The air is cold so I know it is not the freon helpful? There is a blend door in your heater and it’s either stuck or not working. It ‘s electrical or vacuum.

An expert who has achieved level 1. Visited the website for 2 consecutive days. Re: TRAILBLAZER BLOWING OUT COLD AIR FROM ONE SIDE AND…

The air won’t blow out the dash vents. It blows out the floor vent and the defroster vent, but it won’t change and blow out the dash vent. Any one know what I need to do to fix this problem?

What should I do if my car vents are not working?

You can try: Turning your key on and pull fuse 39 under the rear seat. Wait for a minute and put it back in. Let it sit for couple of minutes and restart the engine, might be good to go. Here is what it will be like on your car. Please let us know what happens. Cheers, helpful? Ok, thanks for your help! I will try that! helpful?

Why are the vents not working on my Chevy Trailblazer?

When it fails and you disconnect the battery it probally just looses its position and has no idea where it is, rather then have no defrost, which is a saftey issue, it just defaults to floor and defrost. Mine was working fine until I pulled the a/c control unit out… Then no more center vents.

Is there issue with auto climate control not changing from vent to vent?

Has anyone had an issue with the auto climate control not changing from vent to vent? Re: Fan Only Blows Defrost, Won’t Change To Floor Or Vent. Pull the negative battery cable and re-install, making sure it is very tight (also check the positive to make sure it is tight). See if this fixes the problem.

Where does the HVAC blower go on a trailblazer?

My 2004 Trailblazer EXT V6 HVAC mode selection does not change. Currently the blower is only blowing out the floor vents. When I depress the MODE button the display cycles thru the various options. However, the blower only comes out at the floor.

Where are the fuse panels on a Chevy Trailblazer?

Here you will find fuse box diagrams of Chevrolet TrailBlazer 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Where are the servos on a Chevrolet TrailBlazer?

The servos are located with a blower motor behind the passenger rear tire. The controller is under the 2nd row passenger seat along with the fuses. Hope this helps. If you have the rear AC unit too, then the AC is going to both the front condensor and the rear condensor and will take a while to have an effect.

How to replace batery and air in Chevrolet TrailBlazer?

Get into your car and turn the key to the on position, ( but do not start it). Let it sit like this for at least 2 mins. You will hear the actuators recalibrating themselves. After 2 minutes turn the key to off position then start the car and it should be working out of the correct vents.

Why does my AC blower blow out the vents?

If it does, it’s almost certainly due to a vacuum leak. Acceleration does not affect it. If I set the blower on “high” or “Max AC” it will only blow out of the defrost vents.

What to do if your HVAC is stuck in vent mode?

“actuator with the brown and yellow lines going to it” You could remove those lines and test for vacuum with a fingertip. Then rig a rubber hose between actuator and line to give you the ability to pinch the hose for actuator diaphragm diagnosis.

Why does my Blazer blow air to the floor?

My 1999 S10 Blazer LT 4.3L 2WD with computerized climate control will not switch air flow to the floor. I have defrost and top-vent all of the time no matter what position the switch is in, but not to the Floor.

Why does air blow out of dash vents?

“…computerized climate control…” indicates that it has Auto and Manual setting capabilities. “…computerized climate control…” indicates that it has Auto and Manual setting capabilities. Hit the New Thread button and start your post. Vent flow problems are usualy vacumn to heater controls.

Where is the ventilation controller on a trailblazer?

The rear controller has two servos, one that selects either heating or air, and one that controls whether the side or top vents are selected. The servos are located with a blower motor behind the passenger rear tire. The controller is under the 2nd row passenger seat along with the fuses.

Where is the fuse block on a Chevy Trailblazer?

Chevrolet Trailbrazer (2003 – 2004) – fuse box diagram Year of production: 2003,2004 Engine Compartment Fuse Block The fuse block is located under the hood in the engine compartment on the driver’s side of the vehicle.

What to do about a 2004 Chevy Trailblazer?

38 people found this helpful. Did exactly what was suggested by Daniel and ageary63 below for my 2004 Chevy Trailblazer. Removed the fuses (#36 and #39)and then re-inserted them after waiting about a minute. After re-insertion, turned ignition but did NOT start the engine.

Where is the fuse block on a Chevrolet TrailBlazer?

The rear underseat fuse block is located on the driver’s side of the vehicle, under the second-row seat. Pull the seat cushion forward to access the fuse block. The engine compartment fuse block is located in the engine compartment, on the passenger’s side of the vehicle.

Where is the back heater on a trailblazer?

The back heater/AC unit is on the passenger side. There is a servo to control heating and cooling, and another to send air to the floor or roof. Plus fuses under the passenger seat on the driver’s side. The computer that controls the servos is near the fuse box.

Why does air come out of top vents?

According to the schematics I had, this was due to the mode control door not working right. The air would come out of the top vents when I started the car, but it would start clicking then the top vents would close and all the air would come out the floor vents.

How did I Fix my Chevrolet TrailBlazer air conditioner?

Heard the calibration take place behind the A/C controller for about a minute. Once it was quieted, started the ignition and the A/C was working perfectly again!! This fix probably saved me over $400.00 in unnecessary mechanic repairs.

Why does AC stop blowing out the defrost vents?

After installing a new blower fan motor the ac would only come out the defrost vents. The factory vacuum check valve is very hard to get to. So i bypassed it. Now it is working like it should and ac comes out the dash vents. I do not have a vacuum reservoir installed i will have to see if i will need to add it later.

Why are the vents not working on my GMC Envoy?

2006 GMC Envoy upper AC vents not blowing air. Only the lower vents and the windshield blower working.

How to troubleshoot and repair vents low air flow?

Easy step by step guide one how to troubleshoot and repair vent low air flow, this article pertains to most vehicles. Step 1 – Most air control vents are equipped with a flow control door that is located at the vent outlet. This door is controlled by a thumb wheel that when activated will open and close the vent air flow door.

Who is the owner of the Chevrolet TrailBlazer?

GENERAL MOTORS, GM, the GM Emblem, CHEVROLET, the CHEVROLET Emblem, and the names TRAILBLAZER and EXT are registered trademarks of General Motors Corporation. This manual includes the latest information at the time it was printed. We reserve the right to make changes after that time without further notice.

What is the b0159 code on a Trailblazers?

In the Trailblazers and Envoys the mode/vent function is split between the mode and defrost actuators. The B0159 code is for the ambient temperature sensor located behind the grille. It has two wires: light green/black wire and a brown wire.

Is the Chevy Trailblazer EVAP vent canister on YouTube?

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How do I stop no air from dashboard vents?

This door is controlled by a thumb wheel that when activated will open and close the vent air flow door. Work the thumb wheel from one side to the other while checking the airflow. The flow should stop and start again, if the thumb wheel does not make a difference the problem is somewhere else.

How much horsepower does a Chevrolet TrailBlazer have?

1 Engine & Performance 2 Locking Rear Differential (Optional) 3 Four Wheel Drive 4 Straight 6 Cylinder Engine 5 8 Cylinder Engine (Optional) 6 Engine Type: Gas I6 7 Displacement: 4.2L/254 8 Horsepower (Net @ RPM): 291 @ 6000 9 Torque (Net @ RPM): 277 @ 4800 10 Transmission: Automatic w/OD

Why does AC come out the dash vents?

The factory vacuum check valve is very hard to get to. So i bypassed it. Now it is working like it should and ac comes out the dash vents. I do not have a vacuum reservoir installed i will have to see if i will need to add it later. Don’t forget to like, comment, share and subscribe to my channel. Loading…

What kind of air flow does a trailblazer have?

This 2004 Chevrolet Trailblazer came in with the air flow stuck coming out of the defroster. I have already done a post on how to replace the faulty mode actuator, but I did not have a good enough picture to identify all of the actuators on the driver’s side of the dash.

What are the actuators on a 2004 Chevy Trailblazer?

The view below shows the three actuators and is taken from the perspective of the driver’s feet, looking above the accelerator pedal and towards the center of the dash. If you click on the picture it will enlarge to show more detail. This layout generally applies to 2003, 2004, 2005 2006, 2007, 2008 and 2009 Chevrolet Trailblazer and GMC Envoy.

Where is indexing pin on 2004 Chevrolet TrailBlazer?

This second group of vehicles, of course did not exist, during all years between 2003-2009. Once the mode actuator is removed and the new one is ready to be installed, you will need to locate the indexing pin as shown in the picture below. That pin slides into the notch on the white gear on the actuator.

What kind of blower does a trailblazer have?

This 2006 Chevrolet Trailblazer came in with the complaint that the blower did not work at any speed. This repair applies to 2002 -2009 Chevrolet Trailblazers and GMC Envoys,2002-2004 Oldsmobile Bravada, 2004-2007 Buick Rainier, 2002-2008 Isuzu Ascender.

How can I tell if my blower motor is faulty?

This can also sometimes be confirmed by bumping the blower motor with the switches on. If the motor starts after bumping the motor is faulty. One can also remove the blower motor and apply 12 volts (power and ground) directly to the motor.

Why is my Chevrolet TrailBlazer AC not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My A/C Working? What are common reasons my Chevrolet Trailblazer has air conditioning problems?

What to do if your air conditioner is not working?

Replacement of most air conditioning components requires complete evacuation of the air conditioning system with a refrigerant recovery machine. Once components are re-installed, the technician will remove all air from the system in preparation for recharging the system with new refrigerant.

Why are my front vents on my Chevy Trailblazer not working?